B-3 超高負荷タービン翼列内の流れの数値解析(空力I,一般講演)

概要

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The increase of blade loading of turbine cascade makes it possible to reduce the number of blades and the stages. As a result, the reduction of the weight of a gas turbine can be accomplished. However, strong secondary flows appear in such highly loaded turbine cascades due to the high turning angles, and reduce the turbine efficiency. In the present study, the flows within a stationary linear ultra-highly loaded turbine cascade (UHLTC) were analyzed numerically in detail. The two kinds of computational grids were used in the computations. The first one had the periodic grid arrangement at the periodic boundary, In the second one, the grids were arranged unperiodically at the periodic boundary in order to increase the orthogonality of the overall grid arrangement. The secondary flows within the UHLTC were revealed clearly by the present computed results. Moreover, the comparisons between the results by the two kinds of grids were performed.
2004-10-01